Astronomers timeline By Arnau25032003 Period: 310 BCE to 230 BCE Aristarchus Period: 360 to 415 Hypatia Period: 1473 to 1543 Copernicus Period: 1546 to 1601 Tycho Brahe Period: 1564 to 1642 Galileo Galilei Period: 1571 to 1630 Kepler Period: 1625 to 1712 Giovanni Domenico Period: 1656 to 1742 Edmond Halley Period: 1738 to 1822 William Herschel Period: 1749 to 1827 Pierre-simon Laplace Period: 1758 to 1840 Heinrich Olbers Period: 1824 to 1910 William Huggins Period: 1868 to 1938 George Ellery Hale Period: 1889 to 1953 Edwin Hubble Period: 1893 to 1960 Walter Baade Period: 1942 to 2018 Stephen Hawking